Dear friends and customers,
I am glad to announce another multi-functioning accelerator for APPLE II.
It could provide a good capability on APPLE II system with faster BASIC speed, better memory and DHGR acceleration.
I spent some months to design and testing it and now want to receive orders from international buyers.
In fact, some month ago I already completed design and sold it several cards for local friends.
but, It took long time for international customers.
I don't have much good eyes now and then every month feel a little different and this card has very small parts and hard to make by hand. New card developing is hard for me.
Spending time and ideas on the new card.. is not just developing... it is exploring the APPLE II system.
When I built new devices, i really wanted to make them different than presents others.
I want to assign unique characteristics for my card and then there could be some special functions with it.
When I considered new features into my products, it doesn't complete easy, always brings other technical issues.
Maybe I still don't understand some of WOZ machine properly....
I don't know how long could I design and make cards for friends....
I had rest some weeks and feel much better now.. so you can give me order to make yours now.
The A2 OverDrive has several funny functions.
One is Digital output.. and we can play WAV songs with it (Of cause, It need a DA converter)
High speed acceleration doesn't give other than the speed...
But, It bring the possibility for your APPLE II.
Faster running software will make other possibility for a real-time-based games..
On the graphics, it could provide smoother faster more object can move at one time period.
But, all software functions... not hard ware additions.. at least still now the accelerator card was as this.
For A2 OverDrive have hardware special functions.
1) interrupt generator
It provide IRQ or NMI interval timer interrupt. user can define the timing of interrupt.
Hope to be used for multi processing and for event processing.
Sold memory area $C100-C7FF which are reserved for ROM on SLOT peripherals.
A2 Overdrive has ability to override this area to own RAM location.
Hence the area can use for User's area ROM or RAM.
Also $C800-CFF0 area also can override it to own RAM.
It is one of my philosophy that if technically possible then try to make new&fun functions.
3) Digital I/O
Many of people wouldn't use it except sound module function to play the WAV (sampling) sound.
I provide it for H/W fun.
8bits Input and 16bit output.
Other small functions such as fixed interval reader, R/W memory speed adjust etc...
Some are provided setup value due to limitation on APPLE II to co-operate it but, others are for special functions those couldn't find other accelerators.
I'm making the English manual for this card and some are completed but, when you order and receive the card, you can have proper manual.
Other information are scattered on this site. just consider it as an hide and seek game.
Please order this card for an engineer who want to make more fun devices for APPLE II.
This is only for the Introduction.
Full users manual would be provided for buyers only.
*RAM works Memory size is 384KB
*8bit Input port now.
• MAX 16Mhz accelerator card for Apple //e and Some revision of APPLE ][+ are works
• Integrated Memory emulation of Saturn (64KB) and RAMWORKS (384KB)
• Two 8bits Digital Output ports
• One 8bits Digital Input port
• Integrated programmable Interrupts generator
• Additional Virtual SLOT RAM on $C100-$CFFE
• A2 OverDrive 65C02 CPU works up to 16Mhz
• Accelerate Main and AUX area
– Accelerates ROM ($D000-$FFFF) and Hi-RAM($D000-$FFFF)
– Accelerates Saturn 64KB and RAMWORSK 384KB
– Accelerates BASIC programs
– Accelerates DHGR and DGR programs
• CPU speed can set to 16Mhz, 7.16Mhz, 3.58Mhz and 1Mhz
*** Parts shortage(Parts price is too expensive now)
I think we are really experiencing serious problems.
I'm using CPLD for this card and the parts price became 4 times.
And I can't make it with the price so, I stop selling it.
But, If you are still interested, please ask me for the price.
Sorry for this.
** Shipping issues
Due to Covid19, only some country covered with the standard shipping costs for shipping.
Please refer to the below and please ask for the shipping costs if your country is not in the list.
In this case, I have to send the package with EMS or for the UPS (Higher costs).
Sorry for it.
Standard Shipping only
Thank you very much